Here's how, Broker:(click to show/hide)
many first person shooters have secret rooms...and?
many first person shooters have secret rooms.Exactly as Rozark says, MM8BDM is made for online gameplay. Players against other player, it creates an unfair advantage to have secret rooms. To top it off, once the majority knows where the secret rooms exist, they aren't even that secret anymore, are they? They just become normal, if not unfair, parts of maps.
quake 3 is based around arenas and there is secret rooms there.